See the top level README for information on where to find documentation for the raspberry pi and the ARM processor inside. Also find information on how to load and run these programs. These examples are for the pi2, see other directories for other flavors of raspberry pi. The raspberry pi family is more similar than different, but I have decided it is easier to manage by grouping the examples by board type. The pi2 is not only a different board but the Broadcom chip is different as well. For the most part the cut out the ARM11 and replaced it with a Cortex A7. Quad core. The peripherals for the pi1 boards were in the ARM address space starting at 0x20xxxxxx, but to allow for more room to have more ram they moved the peripherals to 0x3Fxxxxxx. My preferred way to run examples is to use my bootloader07 kernel.img on the board with an ftdi usb to uart board or cable. I also solder a momentary pushbutton on the RUN pins, which is basically a board reset. There are ways to do this without soldering, pins you can push in rather than solder. Once the sd card is in with bootloader07, press reset, download the intel hex (.hex) version of the program I want to run. Press 'g' to go. Repeat as necessary. Or you can copy the blinker01.bin file to the kernel7.img file on your sd card, replace the sd card and turn the power on.